A Clear Ball Perfect Mason One Quart Canning Jar produced between 1923 and 1933. The Ball Perfect Mason Canning Jar features the open "B" and no underscore. The bottom of the Jar has a "b" or "9". It measures 6 7/8 inches tall and has a top diameter of 2 5/8 inches. The Canning Jar is in nice condition with no chips or cracks. There are air bubbles throughout and the top edge is slightly rough compared with new jars.